四川盆地含硫化氢气田天然气地球化学特征

doi:10.7623/syxb2013S1010

石油学报 ›› 2013, Vol. 34 ›› Issue (增刊一): 84-91.DOI: 10.7623/syxb2013S1010

四川盆地含硫化氢气田天然气地球化学特征

李志生, 李谨, 王东良, 崔会英, 马成华, 王义凤, 孙庆伍

中国石油勘探开发研究院廊坊分院中国石油天然气集团公司天然气成藏与开发重点实验室河北廊坊 065007

收稿日期:2013-02-19 修回日期:2013-06-26 出版日期:2013-09-25 发布日期:2013-09-15
通讯作者: 李志生
作者简介:李志生,男,1964年10月生,1986年毕业于承德石油高等专科学校,2005年获中国石油大学(北京)硕士学位,现为中国石油勘探开发研究院廊坊分院高级工程师,长期从事天然气地球化学研究工作。Email:lizhisheng69@petrochina.com.cn
基金资助:
国家重大科技专项"中国大型气田形成条件、富集规律及目标评价"(2011ZX05007)资助

Geochemical characteristics of natural gas in H₂S-bearing gas fields in Sichuan Basin

LI Zhisheng, LI Jin, WANG Dongliang, CUI Huiying, MA Chenghua, WANG Yifeng, SUN Qingwu

Langfang Branch, PetroChina Research Institute of Exploration and Development; CNPC Key Laboratory of Gas Reservoir Formation and Development, Langfang 065007, China

Received:2013-02-19 Revised:2013-06-26 Online:2013-09-25 Published:2013-09-15

摘要/Abstract

摘要：

以四川盆地内高含硫化氢气藏为研究对象,系统研究了天然气的地球化学特征,并对其成因进行探讨。研究表明,四川盆地含硫化氢天然气干燥系数多接近于1,为干气,天然气中CO₂、N₂、H₂S等非烃含量较高,不同油气区气藏中天然气非烃各组分变化范围大。天然气中硫化氢的硫同位素分布范围为9.3 ‰~31.0 ‰ ,与相同储层中硬石膏的硫同位素具有较好的对应关系,表明天然气中硫化氢的硫元素与同储层硬石膏的硫元素具有相同来源,天然气中的硫化氢为硫酸盐热化学还原反应(TSR)的产物。天然气中硫化氢含量对甲烷氢同位素影响不明显,但随硫化氢含量增加,CO₂含量亦逐渐增大,表明气藏中CO₂的生成与硫化氢关系密切。此外,硫化氢含量对乙烷碳同位素影响大,这可能是由于储层中的TSR反应优先消耗C₂H₆以上的重烃,造成乙烷碳同位素变重,再次印证了高含硫化氢储层发生TSR的事实。

关键词: 硫酸盐热化学还原反应, 地球化学特征, 硫同位素, 含硫化氢气田, 四川盆地

Abstract:

This study investigated the geochemical characteristics and origin of natural gas in H₂S-bearing gas reservoirs in Sichuan Basin. Results show that H₂S-bearing natural gas in Sichuan Basin generally has a dry coefficient close to 1, thus is classified as dry gas. The gas contains high contents of non-hydrogen components including CO₂, N₂ and H₂S, whose compositions vary significantly in gas reservoirs among different oil-gas fields. The sulfur isotope value of H₂S gas varies from 9.3 ‰ to 31.0 ‰ and shows a strong correlation with that of anhydrite in the same reservoirs, indicating that the H₂S components of natural gas and anhydrite in the same reservoirs share identical sulfur source, and that the former is a product of thermochemical sulfate reduction(TSR)reaction. The H₂S content has no significant relation with the hydrogen isotope value of methane. However, the CO₂ content increases with increasing H₂S content, demonstrating that CO₂ generation is closely related to the H₂S component of natural gas in reservoirs. In addition, the H₂S content has a strong relation with the carbon isotope value of ethane, possibly due to TSR reaction that preferentially consumes C₂₊heavy hydrocarbons and thus results in heavier carbon isotope values of ethane. This result once again proves that TSR reaction occurs in H₂S-bearing reservoirs.

Key words: thermochemical sulfate reduction, geochemical characteristics, sulfur isotope, H₂S-bearing gas reservoir, Sichuan Basin

中图分类号:

TE112.11

李志生, 李谨, 王东良, 崔会英, 马成华, 王义凤, 孙庆伍. 四川盆地含硫化氢气田天然气地球化学特征[J]. 石油学报, 2013, 34(增刊一): 84-91.

LI Zhisheng, LI Jin, WANG Dongliang, CUI Huiying, MA Chenghua, WANG Yifeng, SUN Qingwu. Geochemical characteristics of natural gas in H₂S-bearing gas fields in Sichuan Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(增刊一): 84-91.

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四川盆地含硫化氢气田天然气地球化学特征

Geochemical characteristics of natural gas in H₂S-bearing gas fields in Sichuan Basin

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四川盆地含硫化氢气田天然气地球化学特征

Geochemical characteristics of natural gas in H2S-bearing gas fields in Sichuan Basin

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Geochemical characteristics of natural gas in H₂S-bearing gas fields in Sichuan Basin